conformance/rendering/multisample-corruption.html flaky in WebGL1 and 2

TBR=kbr

Bug: 1004581
Change-Id: I027e384cea1233e7fcc948d7989c22b286d7b381
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473160Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817321}

content/test/gpu/gpu_tests/test_expectations/webgl2_conformance_expectations.txt

@@ -165,6 +165,11 @@ crbug.com/798117 [ angle-vulkan win nvidia ] conformance/glsl/bugs/assign-to-swi
 crbug.com/798117 [ linux nvidia ] conformance/glsl/bugs/assign-to-swizzled-twice-in-function.html [ Failure ]
 crbug.com/792210 [ nvidia ] conformance/glsl/bugs/in-parameter-passed-as-inout-argument-and-global.html [ Failure ]
 
+# Fails everywhere
+crbug.com/1004581 [ win ] conformance/rendering/multisample-corruption.html [ RetryOnFailure ]
+crbug.com/1004581 [ linux ] conformance/rendering/multisample-corruption.html [ RetryOnFailure ]
+crbug.com/1004581 [ mac ] conformance/rendering/multisample-corruption.html [ RetryOnFailure ]
+
 ####################
 # Win failures     #
 ####################

content/test/gpu/gpu_tests/test_expectations/webgl_conformance_expectations.txt

@@ -165,6 +165,10 @@ crbug.com/1082533 [ mac intel ] conformance/textures/misc/texture-copying-and-de
 crbug.com/1018028 [ win angle-vulkan nvidia ] conformance/rendering/bind-framebuffer-flush-bug.html [ Failure ]
 crbug.com/1110111 [ win nvidia ] conformance/rendering/point-no-attributes.html [ RetryOnFailure ]
 
+crbug.com/1004581 [ win ] conformance/rendering/multisample-corruption.html [ RetryOnFailure ]
+crbug.com/1004581 [ linux ] conformance/rendering/multisample-corruption.html [ RetryOnFailure ]
+crbug.com/1004581 [ mac ] conformance/rendering/multisample-corruption.html [ RetryOnFailure ]
+
 # Skipping new tests
 crbug.com/angleproject/5038 conformance/extensions/ext-color-buffer-half-float.html [ Skip ]
 
@@ -391,7 +395,6 @@ crbug.com/angleproject/2926 [ win amd angle-vulkan passthrough ] deqp/data/gles2
 crbug.com/angleproject/2926 [ win amd angle-vulkan passthrough ] deqp/data/gles2/shaders/linkage.html [ Failure ]
 crbug.com/974347 [ win amd angle-vulkan passthrough ] conformance/textures/image/tex-2d-luminance-luminance-unsigned_byte.html [ Failure ]
 crbug.com/974347 [ win amd angle-vulkan passthrough ] conformance/textures/image/tex-2d-luminance_alpha-luminance_alpha-unsigned_byte.html [ Failure ]
-crbug.com/1004581 [ win amd angle-vulkan passthrough ] conformance/rendering/multisample-corruption.html [ Failure ]
 crbug.com/1010942 [ win amd angle-vulkan passthrough ] conformance/glsl/samplers/glsl-function-texture2dproj.html [ Failure ]
 crbug.com/angleproject/4286 [ win amd angle-vulkan passthrough ] conformance/rendering/out-of-bounds-array-buffers.html [ Failure ]